java 验证码登陆界面_以java实现的一个简单登录界面（带验证码）

你的名字 2022-11-02 11:50 227阅读 0赞

importjava.awt.Color;importjava.awt.Dimension;importjava.awt.Font;importjava.awt.FontMetrics;importjava.awt.Graphics;importjava.awt.Graphics2D;importjava.awt.event.MouseEvent;importjava.awt.event.MouseListener;importjava.util.Random;importjavax.swing.JComponent;public class Yanzhencode extends JComponent implementsMouseListener \{private String codes; //自动生成的验证码

private int width, height = 40; //设置验证码高度、宽度

private int codesLength = 4; //设置代码长度

private Random random = new Random(); //生成数字的方法

publicYanzhencode() \{

width= this.codesLength \* 16 + (this.codesLength - 1) \* 10; //根据验证码长度设置宽度

setPreferredSize(new Dimension(width, height)); //设置背景大小

setSize(width, height); //设置验证码长度和宽度

this.addMouseListener(this);

setToolTipText("点击可更换验证码");

\}//得到生成的验证码

public intgetCodesLength() \{returncodesLength;

\}//设置验证码的长度

public void setCodesLength(intcodeLength) \{if(codesLength < 4) \{this.codesLength = 4;

\}else\{this.codesLength =codeLength;

\}publicString getCode() \{returncodes;

\}//让验证码产生随机的颜色

public Color getRandColor(int min, intmax) \{if (min > 255)

min= 255;if (max > 255)

max= 255;int red = random.nextInt(max - min) +min;int green = random.nextInt(max - min) +min;int blue = random.nextInt(max - min) +min;return newColor(red, green, blue);

\}//设置验证码具体的数字或字母是什么

protectedString generateCode() \{char\[\] codes = new char\[this.codesLength\];for (int i = 0, len = codes.length; i < len; i++) \{if(random.nextBoolean()) \{

codes\[i\]= (char) (random.nextInt(10) + 48);

\}else\{

codes\[i\]= (char) (random.nextInt(26) + 97);

\}this.codes = newString(codes);return this.codes;

@Overrideprotected voidpaintComponent(Graphics g) \{super.paintComponent(g);if(this.codes == null || this.codes.length() != this.codesLength) \{ //判断生成的验证码是否为空或超出长度

this.codes =generateCode();

width= this.codesLength \* 16 + (this.codesLength - 1) \* 10;super.setSize(width, height); //接口使用，验证码字体大小

super.setPreferredSize(new Dimension(width, height));//接口使用，验证码背景大小

Font mFont = new Font("Arial", Font.BOLD | Font.ITALIC, 25); //设置字体和字体大小

g.setFont(mFont); //设置对象//绘制出验证码的背景的矩形轮廓

Graphics2D g2d =(Graphics2D) g;

g2d.setColor(getRandColor(200, 250));

g2d.fillRect(0, 0, width, height);

g2d.setColor(getRandColor(180, 200));

g2d.drawRect(0, 0, width - 1, height - 1);//绘制出验证码背景的线

int i = 0, len = 150;for (; i < len; i++) \{int x = random.nextInt(width - 1);int y = random.nextInt(height - 1);int x1 = random.nextInt(width - 10) + 10;int y1 = random.nextInt(height - 4) + 4;

g2d.setColor(getRandColor(180, 200));

g2d.drawLine(x, y, x1, y1);

\}//绘制出验证码的具体字母

i = 0; len = this.codesLength;

FontMetrics fm=g2d.getFontMetrics();int base = (height - fm.getHeight())/2 +fm.getAscent();for(;i

g2d.rotate(random.nextInt(10)\*0.01\*b);

g2d.setColor(getRandColor(20, 130));

g2d.drawString(codes.charAt(i)+"", 16 \* i + 10, base);

\}//下一个验证码

public voidnextCode() \{

generateCode();

repaint();